# FEMTOSMDC010F-2

**Littelfuse** · Resettable Fuses · 0603

FEMTOSMDC010F-2 from Littelfuse, in a 0603. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1 | passive | One tin-plated terminal of the non-polarized PTC device, rated 12.0 VDC maximum with 40 A short circuit current, 0.10 A hold and 0.25 A trip at 25°C. |
| 2 | 2 | passive | Second tin-plated terminal of the non-polarized PTC device, interchangeable with the other terminal, with 1.70 to 8.00 ohms resistance at 25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 0603 |
| Category | Circuit Protection |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Maximum Electrical Rating: Voltage |  |  |  | 12 | VDC |  | 1 |
| Maximum Electrical Rating: Short Circuit Current |  |  |  | 40 | A |  | 1 |
| Time to trip |  |  |  | 0.1 | SECONDS | at 25°C, 0.7A | 1 |
| Resistance |  | 1.7 |  | 8 | OHMS | at 25°C; maximum measured 1 hour after reflow | 1 |
| Tripped-state power dissipation |  |  |  | 0.5 | WATTS | at 25°C, 12.0V | 1 |

## CAD (KiCad official)

- Symbol: `FEMTOSMDC010F-2`
- Footprint: `Fuse:Fuse_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `femtosmdc010f-2-etched.step` / `femtosmdc010f-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `femtosmdc010f-2.step` / `femtosmdc010f-2.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590147904876023808) (2 pp, sha256 `16b9e9ddb2318e14`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/femtosmdc010f-2-datasheet.pdf)